The oxide QC formation is forced by large alkaline earth metal atoms and the reduction of their mutual electrostatic repulsion. Here we demonstrate the solution of the oxide QC structure by synchrotron-radiation based surface x-ray diffraction (SXRD) refinement of its largest-known approximant. Furthermore, the principles that guide the formation of quasicrystals (QCs) in oxides are elusive since the principles that are known to drive metallic QCs are expected to fail for oxides. ![]() However, despite investigations by scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), low-energy electron microscopy (LEEM), photoemission spectroscopy as well as density functional theory (DFT), their structure is still controversial. ![]() Dodecagonal oxide quasicrystals are well established as examples of long-range aperiodic order in two dimensions.
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